TB 9-6625-2176-35
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
CONSTANT AMPLITUDE SIGNAL GENERATOR
AN/USM-272
AND
TEKTRONIX, TYPE 191
Headquarters, Department of the Army, Washington, DC
16 May 1988
TB 9-6625-2176-35, 15 April 1987, is changed as follows:
1. Remove old pages and insert new pages as indicated below. New or changed material is indicated by a vertical
bar in the margin of the page.
Change 2
Remove pages Insert pages
1 and 2 1 and 2
7 and 8 7 and 8
2. File this change sheet in front of the publication for reference purposes.
By Order of the Secretary of the Army:
CARL E. VUONO
General, United States Army
Chief of Staff
Official:
R. L. DILWORTH
Brigadier General, United States Army
The Adjutant General
Distribution:
To be distributed in accordance with DA Form 12-34C, Block No. 319, requirements for calibration procedures
publications.
PIN NO: 061693-002
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
CONSTANT AMPLITUDE SIGNAL GENERATOR
AN/USM-272
TEKTRONIX, TYPE 191
Headquarters, Department of the Army, Washington, DC
31 March 1988
TB 9-6625-2176-35, 15 April 1987, is changed as follows:
TB 9-6625-2176-35
Change 1
AND
1. Remove old pages and insert new pages as indicated below. New or changed material is indicated by a vertical
bar in the margin of the page.
Remove pages Insert pages
7 and 8 7 and 8
2. File this change sheet in front of the publication for reference purposes.
By Order of the Secretary of the Army:
CARL E. VUONO
General, United States Army
Chief of Staff
Official:
R. L. DILWORTH
Brigadier General, United State Army
The Adjutant General
Distribution:
To be distributed in accordance with DA Form 12-34C, Block No. 319, requirements for calibration procedures
publications.
THIS PUBLICATION IS A COURTESY QUICK COPY FRCM THE UNITED STATES ARMY
PUBLICATICNS DISTRIBUTION CENTER, ST. LOUIS, MISSOURI TO MEET YOUR NEEDS WHILE
WE REPLENISH OUR RULAR STOCK.
*TB 9-6625-2176-35
SUPERSEDED COPY DATED 2 AUGUST 1978
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
CONSTANT AMPLITUDE SIGNAL GENERATOR
AN/USM-272 AND TEKTRONIX, TYPE 191
Headquarters, Department of the Army, Washington, DC
15 April 1987
Approved for public release; distribution is unlimited.
REPORTING OF ERRORS
You can help improve this publication by calling attention to errors and by recommending
improvements and stating your reasons for the recommendations. Your letter or DA Form 2028,
Recommended Changes to Publications, should be mailed directly to Commander, U.S. Army TMDE
Support Group, ATTN: AMXTM-LPP, Redstone Arsenal, AL 35898-5400. A reply will be furnished
directly to you.
SECTION I. IDENTIFICATION AND DESCRIPTION
Test instrument identification ................................................... 1 2
Forms, records, and reports-.................................................... 2 2
Calibration description.............................................................. 3 2
II. EQUIPMENT REQUIREMENTS
Equipment required.................................................................. 4 3
Accessories required................................................................ 5 3
III. CALIBRATION PROCESS
Preliminary instructions............................................................ 6 4
Equipment setup ..................................................................... 7 4
Amplitude accuracy.................................................................. 8 5
Frequency accuracy................................................................. 9 7
Frequency response................................................................. 10 7
Power supply ........................................................................... 11 9
Final procedure........................................................................ 12 9
Paragraph Page
*This bulletin supersedes TB 11-6625-2384-35, 2 August 1978, including all changes.
1
SECTION I
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification. This bulletin
provides instructions for the calibration of Constant
Amplitude Signal Generator, AN/USM-272 and
Tektronix, Type 191. The manufacturer's manual and
TM 116625-2384-15 were used as the prime data
sources in compiling these instructions. The equipment
being calibrated will be referred to as the TI (test
instrument) throughout this bulletin.
a. Model Variations. None.
b. Time and Technique. The time required for
this calibration is approximately 4 hours, using the dc
and low frequency technique.
2. Forms, Records, and Reports
Table 1. Calibration Description
Test instrument
parameters
Amplitude (at 50 kHz into Range: 0.5 to 5 V
50W load) Accuracy: ±3% of indicated amplitude
Frequency (into 50W load) Range: 50 kHz and 0.35 to 100 MHz
Frequency response Range: 0.35 to 100 MHz at .5 to 5.5 V
TB 9-6625-2176-35
a. Forms, records, and reports required for
calibration personnel at all levels are prescribed by TB
750-25.
b. Adjustments to be reported are designated (R)
at the end of the sentence in which they appear. When
adjustments are in tables, the (R) follows the
designated adjustment. Report only those adjustments
made and designated with (R).
3. Calibration Description. TI parameters and
performance specifications which pertain to this
calibration are listed in table 1.
Performance
specifications
Range: 50 to 500 mV
Accuracy: ±4% of indicated amplitude
Range: 5 to 50 mV
Accuracy: ±5% of indicated amplitude
Accuracy: ±2%
Accuracy: £ ±3% from 50 kHz value
Change 2 2
SECTION II
EQUIPMENT REQUIREMENTS
TB 9-6625-2176-35
4. Equipment Required. Table 2 identifies the specific
equipment to be used in this calibration procedure. This
equipment is issued with Secondary Transfer Calibration
Standards Set AN/GSM-286. Alternate items may be
used by the calibrating activity when the equipment
listed in table 2 is not available. The items selected
must be verified to perform satisfactorily prior to use
and must bear evidence of current calibration. The
equipment must meet or exceed the minimum use
specifications listed in table 2. The accuracies listed in
Table 2. Minimum Specifications of Equipment Required
Item Common name Minimum use
A1 AUTOTRANSFORMER Range: 105 to 125 V ac
Accuracy: ±1%
A2 DC VOLTAGE STANDARD Range: 0 to 5 V dc
Accuracy: ±0.01%
A3 DIGITAL VOLTMETER Range: 0 to -12 V dc
0.0167 to 1.820
V rms
Accuracy: ±0.75%
A4 DIFFERENTIAL VOLTMETER Range: 0.9 to 1.1 mV
Accuracy: ±0.75%
A5 FREQUENCY COUNTER Range: 50 kHz to 100 MHz
Accuracy: 0.5%
A6 THERMAL CONVERTER Range: 50 kHz to 100 MHz
at 5 V
Accuracy: ±0.75%
table 2 provide a four-to-one ratio between the standard
and TI.
5. Accessories Required. The accessories listed in
table 3 are issued as indicated in paragraph 4 above
and are used in this calibration procedure. When
necessary, these items may be substituted by
equivalent items, unless specifically prohibited.
specifications
Manufacturer and model
(part number)
General Radio, Model
W10MT3AS3 or Ridge,
Model 9020F (7910809)
John Fluke, Model 332B/AF
(332B/AF)
Hewlett-Packard, Model
3490AOPT060 (3490AOPT060)
Dana, Model 5000, or Dana,
Model 5000 w/641
John Fluke, Model 887AB/AN
(887AB/AN)
Hewlett-Packard, Model
5345A (MIS-28754/1
Type 1) w/5355A and
K87-59992A
Ballantine, Model 1394A
(MIS-10221)
3
Table 3. Accessories Required
Item Common name Description
(part number)
B1 ADAPTER BNC jack to double banana plug terminations
(7907592)
B2 ADAPTER GR plug to BNC jack (MS75093)
B3 CABLE CG-3364/U, GR-874 to GR-874, 50W, 5 ns (p/o TI)
B4 CABLE 36-in., RG-58/U; BNC to double banana
plug terminations (7907471)
32-in., single banana plug to test hook
B5 LEAD
1
(black) (7915941-2)
B6 TERMINATION DA-464/U, GR-874 to BNC plug, 50W (p/o TI)
1
Two required.
SECTION III
CALIBRATION PROCESS
TB 9-6625-2176-35
6. Preliminary Instructions
a. The instructions outlined in paragraphs 6
and 7 are preparatory to the calibration process.
Personnel should become familiar with the entire
bulletin before beginning the calibration.
b. Items of equipment used in this procedure are
referenced within the text by common name and item
identification number as listed in tables 2 and 3. For the
identification of equipment referenced by item numbers
prefixed with A, see table 2, and for prefix B, see table
3.
c. Unless otherwise specified, verify the result of
each test and, whenever the test requirement is not met,
take corrective action before continuing with the
calibration. Adjustments required to calibrate the TI
are included in this procedure. Additional
maintenance information is contained in the
manufacturer's manual and TM 11-66252384-15 for this
TI.
d. When indications specified in paragraphs 8
through 10 are not within tolerance, perform the power
supply check prior to making adjustments. After
adjustments are made, repeat paragraphs 8 through 10.
Do not perform power supply check if all other
parameters are within tolerance.
e. Unless otherwise specified, all controls and
control settings refer to the TI.
7. Equipment Setup
WARNING
HIGH VOLTAGE is used or exposed
during the performance of this
calibration. DEATH ON CONTACT
may result if personnel fail to
observe safety precautions.
a. Connect TI to autotransformer (A1).
4
b. Connect autotransformer to a 115-V ac source
and adjust for a 115-V ac output.
c. Set POWER switch to ON, and allow at least 5
minutes for TI to reach operating temperature.
8. Amplitude Accuracy
a. Performance Check
(1) Connect digital voltmeter (A3) to
OUTPUT using adapter, cable, and termination
(BI, B3, and B6).
(2) Position controls as listed in (a) through
(d) below:
(a) AMPLITUDE switch to 5 and
VARIABLE control to CAL.
(b) AMPLITUDE RANGE switch to .5-
5V.
(c) FREQUENCY RANGE switch to
50kHz ONLY.
(d) Frequency dial to .5 on .35 to .75
scale.
TB 9-6625-2176-35
(3) If digital voltmeter does not indicate
between 0.171 and 0.182 V rms, perform b below.
(4) Adjust autotransformer (A 1) output
from 105to 125 V ac. Digital voltmeter indication will
remain between 0.171 and 0.182 V rms.
(5) Adjust autotransformer output to
115 V ac.
(6) Set AMPLITUDE and AMPLITUDE
RANGE switches to settings listed in table 4. If digital
voltmeter does not indicate within limits specified,
perform b below.
b. Adjustments
(1) Connect negative side of digital voltmeter
(A3) to collector of Q127 (fig. 1) and positive to center
arm of potentiomenter R55 (fig. 1) using leads (B5).
(2) Set AMPLITUDE switch to 50 and
AMPLITUDE RANGE switch to.5-5V.
(3) Adjust potentiometer R55 for 1 V dc
+.005-V indication on digitial voltmeter (R).
(4) Set AMPITUDE switch to 5.
(5) Repeat a(l) above.
(6) Adjust potentiometer R51 (fig. 2) for
0.177-V rms indication on digital voltmeter (R).
Table 4. Amplitude Accuracy
Test instrument Digital voltmeter indications
(V rms)
AMPLITUDE AMPLITIDE RANGE
switch settings switch settings Min Max
10 .5-5V 0.342 0.364
15 .5-5V 0.514 0.546
20 .5-5V 0.685 0.728
25 5-5V 0.857 0.910
30 .5-5V 1.028 1.092
35 .5-5V 1.200 1.274
40 .5-5V 1.371 1.456
45 .5-5V 1.543 1.638
50 .5-5V 1.714 1.820
50 50-500mV 0.169 0.184
50 5-50mV 0.0167 0.0186
5
TB 9-6625-2176-35
Figure 1. Test instrument - Right side view.
Figure 2. Test instrument - left side view
6
(7) Repeat (1) through (6) above as
necessary to compensate for interaction of adjustments.
9. Frequency Accuracy.
a. Performance Check.
(1) Connect frequency counter (A5) to
OUTPUT, using cable and termination (B3 and B6).
(2) Position controls as listed in (a) through
(d) below:
(a) AMPLITUDE switch to 50.
Table 5. Frequency Accuracy
Test instrument Frequency counter Adjustments
FREQUENCY RANGE Frequency dial indications (MHz) (R)
switch settings settings Min Max
.35-.75 .35 0.343 0.357 T14 (fig. 2)
.75-1.6 1.6 1.568 1.632 C18 (fig. 1)
.75-1.6 .75 0.735 0.765 T18 (fig. 2)
1.6-3.6 3.6 3.528 3.672 C22 (fig. 1)
1.6-3.6 1.6 1.568 1.632 T22 (fig. 2)
3.6-8 8 7.840 8.160 C26 (fig. 1)
3.6-8 3.6 3.528 3.672 T26 (fig. 2)
8-18 18 17.640 18.360 C30 (fig. 1)
8-18 8 7.840 8.160 T30 (fig. 2)
18-42 42 41.160 42.840 C34 (fig. 1)
18-42 18 17.640 18.360 T34 (fig. 2)
42-100 100 98.00 102.00 C38 (fig. 1)
42-100 42 41.160 42.840 T38 (fig. 1)
50 kHz ONLY .5 0.049 0.051 T10 (fig. 2)
TB 9-6625-2176-35
(b) AMPLITUDE RANGE switch to 50-
500mV.
(c) FREQUENCY RANGE switch to
.35-.75.
(d) Frequency dial to .75 on .35.75
scale.
(3) If frequency counter does not indicate
between 735 and 765 kHz, perform b below.
(4) Position TI controls as listed in table 5. If
frequency counter does not indicate within limits
specified, perform corresponding adjustment listed in
table 5.
b. Adjustments. Adjust C14 (fig. 1) for frequency
counter indication of 750 kHz (R).
10. Frequency Response
a. Performance Check
(1) Connect equipment as shown in figure 3,
connection A.
(2) Position controls as listed in (a) through
(c) below:
Change 1 7
(a) AMPLITUDE switch to 50.
(b) AMPLITUDE RANGE switch to .5-5.
(c) FREQUENCY RANGE switch to 50
kHz ONLY.
(3) Record differential voltmeter (A4)
indication as VI.
(4) Connect equipment as shown in figure 3,
connection B.
(5) Adjust dc voltage standard (A2) output
until value of VI is indicated on differential voltmeter.
Record dc voltage standard indication.
(6) Adjust dc voltage standard to +3 percent of
value recorded in (5) above. Record differential
voltmeter indication as V2.
TB 9-6625-2176-35
(7) Adjust dc voltage standard to -3 percent
of value recorded in (5) above. Record differential
voltmeter indication as V3.
(8) (Deleted)
(9) Reconnect equipment as shown in (fig.
3), connection A.
(10) Set FREQUENCY RANGE switch to each
range POSITION, and at each range POSITION rotate
the frequency dial throughout this range.
Differential voltmeter will indicate between V2 and V3
for frequencies from 350 kHz to 100 MHz.
b. Adjustments. No adjustments can be made.
Figure 3. Frequency response - equipment setup
*U.S. Government Printing Office:1988-530-022/80016
Change 2 8
11. Power Supply
Do not perform power supply check if
all other parameters are within
tolerance.
NOTE
TB 9-6625-2176-35
b. Adjustments. Adjust R122 (fig. 1) for -11 V dc
indication on digital voltmeter (R).
12. Final Procedure.
a. Performance Check. Connect digital voltmeter
(A3) between collector of Q127 (fig. 1) and chassis
ground using leads (BS). If digital voltmeter does not
indicate between -10.45 and -11.35 V dc, perform b
below.
a. Deenergize and disconnect all equipment
and reinstall protective cover on TI.
b. Annotate and affix DA Label/Form in
accordance with TB 750-23.
By Order of the Secretary of the Army:
JOHN A. WICKHAM, JR.
General, United States Army
Chief of Staff
Official:
R. L. DILWORTH
Brigadier General, United States Army
The Adjutant General
Distribution:
To be distributed in accordance with DA Form 12-34C, Block No. 319, requirements for calibration procedures
publications.
* U.S. GOVERNMENT PRINT1NG OFFICE: 1990731 16/W21173
9
The Metric System and Equivalents
Linear Measure Liquid Measure
1 centimeter = 10 millimeters = .39 inch 1 deciliter = 10 centiliters = 3.38 fl. ounces
1 decimeter = 10 centimeters = 3.94 inches 1 liter = 10 deciliters = 33.81 fl. ounces
1 meter = 10 decimeters = 39.37 inches 1 dekaliter = 10 liters = 2.64 gallons
1 dekameter = 10 meters = 32.8 feet 1 hectoliter = 10 dekaliters = 26.42 gallons
1 hectometer = 10 dekameters = 328.08 feet 1 kiloliter = 10 hectoliters = 264.18 gallons
1 kilometer = 10 hectometers = 3,280.8 feet
Weights
1 centigram = 10 milligrams = .15 grain 1 sq. decimeter = 100 sq. centimeters = 15.5 sq. inches
1 decigram = 10 centigrams = 1.54 grains 1 sq. meter (centare) = 100 sq. decimeters = 10.76 sq. feet
1 gram = 10 decigram = .035 ounce 1 sq. dekameter (are) = 100 sq. meters = 1,076.4 sq. feet
1 decagram = 10 grams = .35 ounce 1 sq. hectometer (hectare) = 100 sq. dekameters = 2.47 acres
1 hectogram = 10 decagrams = 3.52 ounces 1 sq. kilometer = 100 sq. hectometers = .386 sq. mile
1 kilogram = 10 hectograms = 2.2 pounds
1 quintal = 100 kilograms = 220.46 pounds Cubic Measure
1 metric ton = 10 quintals = 1.1 short tons
1 centiliter = 10 milliters = .34 fl. ounce
Square Measure
1 sq. centimeter = 100 sq. millimeters = .155 sq. inch
1 cu. centimeter = 1000 cu. millimeters = .06 cu. inch
1 cu. decimeter = 1000 cu. centimeters = 61.02 cu. inches
1 cu. meter = 1000 cu. decimeters = 35.31 cu. feet
Approximate Conversion Factors
To change To Multiply by To change To Multiply by
inches centimeters 2.540 ounce-inches Newton-meters .007062
feet meters .305 centimeters inches .394
yards meters .914 meters feet 3.280
miles kilometers 1.609 meters yards 1.094
square inches square centimeters 6.451 kilometers miles .621
square feet square meters .093 square centimeters square inches .155
square yards square meters .836 square meters square feet 10.764
square miles square kilometers 2.590 square meters square yards 1.196
acres square hectometers .405 square kilometers square miles .386
cubic feet cubic meters .028 square hectometers acres 2.471
cubic yards cubic meters .765 cubic meters cubic feet 35.315
fluid ounces milliliters 29,573 cubic meters cubic yards 1.308
pints liters .473 milliliters fluid ounces .034
quarts liters .946 liters pints 2.113
gallons liters 3.785 liters quarts 1.057
ounces grams 28.349 liters gallons .264
pounds kilograms .454 grams ounces .035
short tons metric tons .907 kilograms pounds 2.205
pound-feet Newton-meters 1.356 metric tons short tons 1.102
pound-inches Newton-meters .11296
Temperature (Exact)
°F Fahrenheit 5/9 (after Celsius °C
temperature subtracting 32) temperature
PIN: 061693-000
Loading...